help:URL重写超难度问题

Question

这个网址http://a.com/http://www.b.com如何重写为http://a.com/share.aspx?url=http://www.b.com

Answer 1

            string str = "http://a.com/http://www.b.com";
            string[] temp = str.Split(new string[] { "http://" }, StringSplitOptions.RemoveEmptyEntries);
            string result = string.Concat("http://", temp[0], "share.aspx?url=", "http://", temp[1]);
            Console.WriteLine(result);

Answer 2

            string url = "http://a.com/http://www.b.com";            int p = url.LastIndexOf("http");
            string result = url.Substring(0, p) + "share.aspx?url=" + url.Substring(p);